al / a la / del / de la / en el / en la
As I mentioned before, I am not the author of this content. The original credits are included in the PowerPoint file. This material is publicly available over the Internet. This is my contribution to helping the author(s) spread them and reach more people.
Personally I do NOT use these materials in my classes, as I love creating my own resources. However, I know for a fact that they can be very useful for someone rushing against the clock to prepare for a class.
To download the file, right click the mouse over the download link and select SAVE AS or SAVE TARGET AS (or similar wording depending on your browser)